Mechanic reports on emergency floor escape lighting; seat mounted and exit marker power supply batteries on B757-200's; are frequently found not fully charged; resulting in less than twelve volts.

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Attributes
ACN	819042
Time
Date	200901
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	B757-200
Flight Phase	Parked
Component
Aircraft Component	Emergency Exit Lighting
Person 1
Function	Technician
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural FAR Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy

Narrative:

Floor escape lighting; seat mounted; and exit marker power supply batteries frequently are found not fully charged resulting in less than 12 volts. The air carrier 757 maintenance manual and MEL have no voltage limitations. Keep rechargeable batteries for escape path lighting on a maintaining charging system. Emergency batteries; coming out of stock; frequently not fully charged.

Original NASA ASRS Text

Title: Mechanic reports on emergency floor escape lighting; seat mounted and exit marker power supply batteries on B757-200's; are frequently found not fully charged; resulting in less than twelve volts.

Narrative: Floor escape lighting; seat mounted; and exit marker power supply batteries frequently are found not fully charged resulting in less than 12 Volts. The Air Carrier 757 Maintenance Manual and MEL have no voltage limitations. Keep rechargeable batteries for escape path lighting on a maintaining charging system. Emergency batteries; coming out of stock; frequently not fully charged.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.